20406504345 has 32 divisors (see below), whose sum is σ = 33426864000. Its totient is φ = 10627129344.

The previous prime is 20406504343. The next prime is 20406504403. The reversal of 20406504345 is 54340560402.

It is not a de Polignac number, because 20406504345 - 2¹ = 20406504343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406504343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54489 + ... + 209241.

It is an arithmetic number, because the mean of its divisors is an integer number (1044589500).

Almost surely, 2^20406504345 is an apocalyptic number.

It is an amenable number.

20406504345 is a deficient number, since it is larger than the sum of its proper divisors (13020359655).

20406504345 is a wasteful number, since it uses less digits than its factorization.

20406504345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154969.

The product of its (nonzero) digits is 57600, while the sum is 33.

The spelling of 20406504345 in words is "twenty billion, four hundred six million, five hundred four thousand, three hundred forty-five".